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LS7232NT

(631) 271-0400 FAX (631) 271-0405

LSI / CSI
LS7232NT
(631) 271-0400 FAX (631) 271-0405
LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747
A3800
PROXIMITY / TOUCH CONTROL HALOGEN LAMP DIMMER
November 2001
PIN ASSIGNMENT - TOP VIEW
CAP SYNC ANODE 1 2 3 LS7232NT 14 13 12 11 10 9 8 V DD (+V) M2 M1 RC LEDO TRIG / Vss (-V)
CATHODE 4 PHOTOUT 5 SENS 6
REMOTE 7
FIGURE 1
7232NT-111501-1
SENS (Pin 6) A positive signal applied at the SENS input controls the turn-on, turn-off and dimming function of the LS7232NT. The SENS input is designed to operate with very low levels of signal, so that it can be directly interfaced with the photoamplifier output. Signal at the SENS input is amplified with a gain of 30. If a photosensor is not to be used, the SENS input can easily be adapted to a touch plate. Signals at the SENS input are classified as SHORT touch and LONG touch. Signals between 50ms and 350ms constitute a SHORT touch, whereas signals longer than 350ms constitute a LONG touch. The functions of these two types of touches are explained in the mode description section. SENS input has an internal pull-down resistor of 10k. REMOTE (Pin 7) For performing dimming operation from remote sites or through wire extensions, the REMOTE input is used. This input is sampled twice during both negative and positive half cycles of the AC, rendering it more immune to noise and hence more suited for carrying signals over extension wires. Vss (Pin 8) Supply voltage, negative terminal.
TRIG / (Pin 9)
7232NT-082101-2
ABSOLUTE MAXIMUM RATINGS: PARAMETER SYMBOL DC Supply Voltage VDD - VSS Any Input Voltage VIN Operating Temperature TA Storage Temperature TSTG DC ELECTRICAL CHARACTERISTICS: PARAMETER Supply Voltage Supply Current Input Logic Levels: SYNC Lo SYNC Hi REMOTE Lo REMOTE Hi SENS Lo SENS Hi RC Lo RC Hi Output Current: LEDO Sink LEDO Source TRIG / Sink RC Sink
VALUE +7 Vss - 0.3 to VDD + 0.3 0 to +90 -65 to +150
SYMBOL VDD IDD
Short Touch: Off to Max (Slew Time) Long Touch: Ramp Time between 38° & 59° Ramp Time between 59° & 155° Dwell at min
sec sec ms
7232NTH-082101-3
PARAMETER Timer Resistor Timer Capacitor Timer Delay Slew Off Rate Slew Off Delay Pre-Off Delay (Mode 7) Slew-Off Delay (Mode 7) LEDO Pulse Width SYNC to LEDO delay LEDO to TRIG / delay LEDO to Strobe delay
SYMBOL R C tRC tsf td tf td7 tsl ttl tB
MIN 200 0.1 1e-3 -
MAX 2M 1200 -
UNIT Ohm µF sec deg / sec deg / sec sec sec sec µs µs µs µs
CONDITION
tRC 63RC 60Hz 50Hz
SYNC (Idealized)
p1 LEDO
The information included herein is believed to be accurate and reliable. However, LSI Computer Systems, Inc. assumes no responsibilities for inaccuracies, nor for any infringements of patent rights of others which may result from its use.
7232NT-092801-4
SHORT SHORT
SHORT
155 MODE 1 59 38 OFF
155 MODE 2 59 38 OFF
NO MEMORY
MEMORY
155 MODE 3 59 38 OFF
FIGURE 3. MODES 1, 2 and 3
SHORT SHORT SENS
SHORT SHORT
SHORT
155 MODE 4 59 38 OFF
NO MEMORY
MEMORY
MODE 5
38 OFF
FIGURE 4. MODES 4 and 5
SHORT SHORT
SHORT
155 MODE 6 59 38 OFF 155 MODE 7 59 38 OFF
FIGURE 5. MODES 6 and 7
7232NT-100101-5
PHASE LOCK LOOP
CONTROL
PHASE MEMORY
DIGITAL COMPARATOR
TRIGGER LOGIC
DRIVER
IR PULSE LOGIC PHOTOUT
DRIVER
CATHODE
ANODE
REMOTE
DECODER
TIMER
FIGURE 6. LS7232NT BLOCK DIAGRAM
FIGURE 7 . PHOTO AMPLIFIER WITH PHOTO DIODE AND GAIN RESISTOR , R f
+ AMP VDD / 2 100K
7232NT-082501-6
FIGURE 8. A TYPICAL DIMMER CIRCUIT WITH NO-TOUCH OPTICAL SENSING AND TOUCH PLATE OPTIONS
N1 R14
G MT1 MT2 R7
SEE NOTE 3 P1
CATHODE
PHOTOUT
ANODE
REMOTE
115VAC OR 220VAC
TOUCH PLATE
LS7232NT R12
D4 R13 P2
TOUCH PLATE
LOAD N O T E S 1) For a No-Touch system, the infra-red transmit diode D3 and and receive D2 should be placed in physical proximity so that when a hand is placed in front of D2 and D3, reflected light from the hand is received by the IR receiver D3 to produce a touch impulse. 2) If a touchplate is used the following parts should be in: R8, R9, C8 and P1. If infrared detector is used the following parts should be in: D2, D3, R4, R5, R6, C7 and N1. 3) If remote sensing is not used the following parts may be removed: R3, R10, R11, R12, R13, C6 and P2. If remote sensing is used these parts should be in and the connection between Pin 7 and Pin 8 must be broken. 4) The load is either an incandescent lamp or the primary of a step-down transformer for a low voltage halogen lamp.
220V (1)